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Was There a Heathkit W-1M or WM?

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PB2

PB2

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Joined 2004
linkedin.com/in/petebasel
I know the Heathkit Williamson W-3M very well. It was the first amplifier that I worked on as a young kid. It was old at the time - caps were probably getting old. This Heathkit version used 5881's, UL, and an Acrosound output transformer.

I found the W-2 Schematic on the net which also uses 5881s, is UL, but has a Peerless output transformer.

I'm working on what I think is a Heathkit, but with 807s, triode connected, and a Peerless OT without UL taps. Here's a picture:
http://baselaudiolabs.googlepages.com/Williamson3.JPG

Was there a version like this from Heathkit, an earlier Williamson? Confirmation or any more info would be appreciated.

Pete B.
 
PB2

PB2

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Joined 2004
linkedin.com/in/petebasel
Yes, I have that also. That seems to be the paper where 6L6 type tubes such as the 807 were tested in place of the original KT-66. The 6l6 types were not rated for the higher plate and screen voltage used in the Williamson. All the Heathkit Williamsons that I've mentioned use a 420-440V plate supply.

That paper does seem to be the basis for the one that I have triode connected rather than Ultra-Linear, and using 807s. I think this is a very early Heathkit implementation. That design seems to be one chassis, and uses more choke filtering. Other than that it is very close to this unit.

Thanks,
Pete B.
 
G

gallon

Member
Joined 2003
PB2 said:

I'm working on what I think is a Heathkit, but with 807s, triode connected, and a Peerless OT without UL taps. Here's a picture:
http://baselaudiolabs.googlepages.com/Williamson3.JPG

Was there a version like this from Heathkit, an earlier Williamson? Confirmation or any more info would be appreciated.

Pete B.
Click to expand...
The Heathkit WA-A1 was reviewed in Audio Engineering of May 1952. It is a PP 807 in triode mode. The Peerless is a custom job. This design is essentially the same as the famous 'Musicians Friend' published in the 1949 Audio Engineering, designed by Sarser, a professional musician. Send a PM and I can send scans for you. You are lucky to have that!
 
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